Is it possible to have Transparancy with the covers, tried adding pngs but end up with either white or black background.

The default black/brown cover does this - as it shows up with a black background in Coverflow, and gray in the details bar.

What I'm trying to do, is have a generic cover for all my short stories, and would like it to be off kilter, at an angle, so not flat - which means if I can't use transparancy it will either look real bad in coverflow or in the details panel.

As a side note, what do others tend to use as covers for short stories that have no generic cover.